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Hi,
I have a view that takes an optional binding boolean variable. I'd like to pass a variable to it from certain views only. The problem I'm having is when I pass a variable, I get the error "Cannot convert value of type 'Binding' to expected argument type 'Binding<Bool?>'", and when I don't, I get the error "Missing argument for parameter 'toggle' in call". Below Is the code I have. Thank you.
Heading(text: "Heading1") // error: Missing argument for parameter 'toggle' in call
Heading(text: "Heading2", toggle: $newEntry) // Cannot convert value of type 'Binding<Bool>' to expected argument type 'Binding<Bool?>'
struct Heading: View {
@State var text: String
@Binding var toggle: Bool?
var body: some View {
VStack {
Spacer()
.frame(height: 25)
HStack {
Text(text)
.font(.system(size: 36))
Spacer()
if text == "str" {
Button(action: { toggle!.toggle() }) {
Image(systemName: "plus")
.foregroundColor(.black)
.font(.system(size: 36))
}
}
}
Spacer()
.frame(height: 25)
}
}
}
Post not yet marked as solved
Hello,
I'm inquiring in regard to information on handling user's subscriptions, specifically if it's possible to cancel a subscription with a line of code. For example:
if condition {
// cancel user's subscription
}
I'm not familiar with the App Store Server API yet, but I glanced at the documentation and I didn't see any information in regard to the question I have. That being said, I'm also wondering where to start with configuring a subscription model for my app.
Any insights would be greatly appreciated. Thank you.
Post not yet marked as solved
Hello,
I was following a tutorial on how to use the SwiftUI Canvas and I can't seem to get it to work. Below is the code that I have.
struct Line {
var points: [CGPoint]
var color: Color
}
struct CanvasView: View {
@State var lines: [Line] = []
@State var selectedColor: Color = Color.black
var body: some View {
ScrollView([.horizontal, .vertical]) {
Canvas { ctx, size in
for line in lines {
var path = Path()
path.addLines(line.points)
ctx.stroke(path, with: .color(line.color), style: StrokeStyle(lineWidth: 5, lineCap: .round, lineJoin: .round))
}
}.gesture(DragGesture(minimumDistance: 0, coordinateSpace: .local)
.onChanged({ value in
let position = value.location
if value.translation == .zero {
lines.append(Line(points: [position], color: selectedColor))
} else {
guard let lastIndex = lines.indices.last else {
return
}
lines[lastIndex].points.append(position)
}
})
)
}
}
}
I'm pretty sure I followed the tutorial exactly so I'm not sure why it isn't drawing. Any help would be greatly appreciated. Thank you.
Post not yet marked as solved
Hello,
I am trying to use the SwiftUI canvas and I'm having a couple of issues. One is that I'd like to be able to fit a canvas view in a ScrollView, but when the canvas is inside a ScrolLView, nothing draws. Additionally, I'm trying to draw lines on the canvas on Appear, but I can't seem to get that to work either. Below is a simplified version of the code I have:
struct Line: Codable, Hashable {
var points: [CGPoint]
var colorName: String?
var rgb: [Double]?
private enum CodingKeys: String, CodingKey {
case points
case colorName
case rgb
}
}
extension CGPoint: Hashable {
public func hash(into hasher: inout Hasher) {
hasher.combine(x)
hasher.combine(y)
}
}
struct CanvasExample: View {
@State var lines: [Line] = []
@State var selectedColor: Color = Color.black
var body: some View {
Canvas { ctx, size in
for line in lines {
var path = Path()
path.addLines(line.points)
ctx.stroke(path, with: .color(line.color), style: StrokeStyle(lineWidth: 5, lineCap: .round, lineJoin: .round))
}
}.gesture(DragGesture(minimumDistance: 0, coordinateSpace: .local)
.onChanged({ value in
let position = value.location
if value.translation == .zero {
lines.append(Line(points: [position], color: selectedColor))
} else {
guard let lastIndex = lines.indices.last else {
return
}
lines[lastIndex].points.append(position)
}
})
)
.onAppear {
lines.append(Line(points: [position], color: .black))
}
}
}
Any help would be greatly appreciated. Thank you.
Post not yet marked as solved
Hi,
I am inquiring in regard to how to handle data from a bluetooth device. The device would send data in JSON format to a Mac via bluetooth, and I would need to constantly refresh or fetch data from the device in real time.
How would I go about this? Any help would be greatly appreciated.
Thank you.
Post not yet marked as solved
Hello,
I'm trying to build a simple button. For some reason, I'm getting the following errors:
Cannot convert value of type '() -> ()' to expected argument type 'String'
Incorrect argument label in call (have 'action:_:', expected 'value:selected:')
Button(action: login) {
ZStack {
RoundedRectangle(cornerRadius: 5)
.fill(Color.black)
.frame(width: UIScreen.main.bounds.width - 50, height: 50)
Text("Sign in")
.foregroundColor(.white)
}
}
All of my buttons in this particular project suddenly have this error. Any help would be greatly appreciated.
Thank you
Post not yet marked as solved
Hello,
I'm having trouble previewing a view that has a binding variable. When it's in the below state, I get the error "Edit placeholder in source file":
static var previews: some View {
Navigation(viewState: Binding<String>)
}
}
When I put a string as a placeholder, I get the error: Cannot convert value of type 'String' to expected argument type 'Binding'
static var previews: some View {
Navigation(viewState: "sign-in")
}
}
The code for the supporting view with the binding variable is below:
struct Navigation: View {
@Binding var viewState: String
var body: some View {
ZStack {
HStack {
Spacer()
Button(action: { toggleView(view: "savings")}) {
Text("Savings")
}
Spacer()
Button(action: { toggleView(view: "settings")}) {
Text("Settings")
}
Spacer()
}
}
.position(x: UIScreen.main.bounds.width / 2, y: UIScreen.main.bounds.height / 2)
.frame(width: UIScreen.main.bounds.width, height: 100)
}
func toggleView(view: String) {
viewState = view
}
}
Any help would be greatly appreciated.
Post not yet marked as solved
Hello,
I noticed there's a glitch with inspect element. Under elements, when I try to uncheck a style property, the whole element's CSS gets removed, sometime's the whole webpage's. I was wondering if there was anything I could do to fix this issue.
Thanks
Post not yet marked as solved
Hello,
I'm having issues with Safari's inspect element. Some of the elements on a webpage I'm working on aren't showing up, however they are present under the Sources tab. I'm not sure why that is. Any help would be greatly appreciated.
Thank you
Update: I made a coding error, it had nothing to do with web inspector.
Post not yet marked as solved
Hello,
I'm using PaintCode for UIGraphics which exports Swift files with an @objc dynamic public class func nested in a NSObject class. With older versions of Swift, could be implemented with the use of a UIKit view and the storyboard.
How could I do this with SwiftUI?
Thanks in advance.
marcofusco111.